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fuse: convert destroy to simple api

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We can use the "force" flag to make sure the DESTROY request is always sent
to userspace.  So no need to keep it allocated during the lifetime of the
filesystem.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi 2019-09-10 15:04:09 +02:00
parent e413754b26
commit 1ccd1ea249
3 changed files with 14 additions and 22 deletions
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2
fs/fuse/file.c
View File

@ -279,7 +279,7 @@ void fuse_release_common(struct file *file, bool isdir)
* synchronous RELEASE is allowed (and desirable) in this case
* because the server can be trusted not to screw up.
*/
fuse_file_put(ff, ff->fc->destroy_req != NULL, isdir);
fuse_file_put(ff, ff->fc->destroy, isdir);
}
static int fuse_open(struct inode *inode, struct file *file)

6
fs/fuse/fuse_i.h
View File

@ -715,6 +715,9 @@ struct fuse_conn {
/** Does the filesystem support copy_file_range? */
unsigned no_copy_file_range:1;
/* Send DESTROY request */
unsigned int destroy:1;
/** The number of requests waiting for completion */
atomic_t num_waiting;
@ -736,9 +739,6 @@ struct fuse_conn {
/** Key for lock owner ID scrambling */
u32 scramble_key[4];
/** Reserved request for the DESTROY message */
struct fuse_req *destroy_req;
/** Version counter for attribute changes */
atomic64_t attr_version;

26
fs/fuse/inode.c
View File

@ -386,14 +386,13 @@ static void fuse_umount_begin(struct super_block *sb)
static void fuse_send_destroy(struct fuse_conn *fc)
{
struct fuse_req *req = fc->destroy_req;
if (req && fc->conn_init) {
fc->destroy_req = NULL;
req->in.h.opcode = FUSE_DESTROY;
__set_bit(FR_FORCE, &req->flags);
__clear_bit(FR_BACKGROUND, &req->flags);
fuse_request_send(fc, req);
fuse_put_request(fc, req);
if (fc->conn_init) {
FUSE_ARGS(args);
args.opcode = FUSE_DESTROY;
args.force = true;
args.nocreds = true;
fuse_simple_request(fc, &args);
}
}
@ -640,8 +639,6 @@ EXPORT_SYMBOL_GPL(fuse_conn_init);
void fuse_conn_put(struct fuse_conn *fc)
{
if (refcount_dec_and_test(&fc->count)) {
if (fc->destroy_req)
fuse_request_free(fc->destroy_req);
put_pid_ns(fc->pid_ns);
put_user_ns(fc->user_ns);
fc->release(fc);
@ -1171,6 +1168,7 @@ static int fuse_fill_super(struct super_block *sb, struct fs_context *fsc)
fc->user_id = ctx->user_id;
fc->group_id = ctx->group_id;
fc->max_read = max_t(unsigned, 4096, ctx->max_read);
fc->destroy = is_bdev;
/* Used by get_root_inode() */
sb->s_fs_info = fc;
@ -1189,12 +1187,6 @@ static int fuse_fill_super(struct super_block *sb, struct fs_context *fsc)
goto err_put_root;
__set_bit(FR_BACKGROUND, &init_req->flags);
if (is_bdev) {
fc->destroy_req = fuse_request_alloc(0);
if (!fc->destroy_req)
goto err_free_init_req;
}
mutex_lock(&fuse_mutex);
err = -EINVAL;
if (file->private_data)
@ -1221,7 +1213,6 @@ static int fuse_fill_super(struct super_block *sb, struct fs_context *fsc)
err_unlock:
mutex_unlock(&fuse_mutex);
err_free_init_req:
fuse_request_free(init_req);
err_put_root:
dput(root_dentry);
@ -1287,6 +1278,7 @@ static void fuse_sb_destroy(struct super_block *sb)
struct fuse_conn *fc = get_fuse_conn_super(sb);
if (fc) {
if (fc->destroy)
fuse_send_destroy(fc);
fuse_abort_conn(fc);